Hypothesis: we get so tired because our motivation runs out

假设：我们感到疲倦是因为动力不足

As we work on a task, we struggle to focus on it or eventually lose interest in it. We become less motivated to do the task. We become drawn to the things we want to do (scrolling social media or reading music blogs, for instance), rather than the things we have to do. And this tension possibly causes fatigue.

当我们完成任务时，我们很难专注于任务本身，最终彻底失去兴趣。我们没有足够的动力去完成这项任务。我们很容易被我们想做的事情所吸引（例如：刷社交媒体或阅读音乐博客），而不是专注于我们必须做的事情。而这种矛盾可能会导致疲劳。

In August, researchers in the UK published new evidence that finds some indirect evidence for the motivational model.

去年8月，英国的研究人员发表了新的结论，他们找到了动机模型的间接证据。

This study tracked 100 nurses in the UK over two 12-hour shifts. Throughout the shifts, the nurses reported how fatigued they felt at regular intervals. They also wore devices that monitored and tracked the amount of physical activity they were engaged in. When the researchers investigated what could possibly explain the fatigue, they found some interesting patterns.

这项研究跟踪了英国的100名护士的两次12小时轮班。在整个轮班期间，护士们需要定时报告他们的疲劳程度。并且，他们的体力活动量可以通过设备被监控跟踪到。当研究人员在研究什么可能解释疲劳时，他们有一些有趣的发现。

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